Pressure control for fluid dispensing devices



Dec. 20, 1932. R v LATHAM 1,891,882

PRESSURE CONTROL FOR FDUID DISPENSING DEVICES Filed Sept. 15, 1950 2 ShetS-SIIGQI l A ilomey Dec. 20, 1932. R. v. LATHAM 1,391,882

PRESSURE CONTROL FOR FLUID DISPENSING DEVICES Filed Sept. 15. 1930 '2 Sheets-Sheet 2 In ventor oeriilai/zam Patented Dec. 20, 1932 ROBERT V. LATHAM, F CORAL GABLES, FLORIDA PRESSURE CONTROL FOR FLUID DISPENSING DEVICES Application filed September 15, 1930. Serial No. 482,046.

This invention relates to a dispensing gun of the fluid operated type which is particularly intended for use in ejecting grease or other lubricant but it is understood, of course, that a gun in accordance with this invention may be used for any purpose and in any manner for which same is found adapted and desirable.

An important object ofvthe invention is to provide, in a manner as hereinafter set forth, a dispensing gun of the aforementioned character including a material containing barrel or cylinder having mounted for reciprocation therein a fluid actuated piston and further including manually controlled means for admitting fluid under pressure to the rear of the barrel or cylinder and automatically operating means for venting the cylinder rearwardly of the piston after the fluid pressure has been cut-off.

Other objects of the invention are to provide a dispensing gun of the character described which will be simple in construction, strong, durable, eflicient in operation and which may be manufactured at low cost.

All of the foregoing and still further obj ects and advantages of the invention may become apparent from a study of the following specification, taken in connection with the accompanying drawings, wherein like characters of reference designate corresponding parts throughout the several views, and wherein:

Figure 1 is a view in side elevation of a dispensing gun constructed in accordance with this invention,

Figure 2 is a vertical longitudinal sectional view through the gun,

Figure 3 is a detail cross sectional view taken substantially on the line 33 of Figure 2 looking in the direction indicated by the arrows,

Figure 4 is a vertical cross sectional view taken substantially on the line 44 of Figure 2 looking in the direction indicated by the arrows.

Referring to the drawings in detail, it will be seen that the reference numeral 1 desig nates an elongated barrel or cylinder which is preferably formed of metal and is of uniform diameter throughout. The barrel or cylinder 1 is open at its ends and has said ends externally threaded, as clearly seen in Figure 2 of the drawings. A cap 2 is removably threaded on the forward end of the barrel 1 and has threaded thereinto a coupling 3 for connecting a flexible conduit 4 to the barrel or cylinder 1.

A removable cap 5 is threaded on the other or rear end portion of the barrel or cylinder 1 and has threaded centrally therein a nipple 6 which projects rearwardly and has threaded thereon an elbow 7. A coupling 8 connects a pipe 9 to the elbow 7 and the pipe 9 normally extends forwardly in substantially parallel relation to the barrel or cylinder 1.

The forward end of the pipe 9 is threadedly connected in the upper end of the riser 10 on the pipe 11. threaded into the forward end of thepipe 11. A valve casing 13 is threaded on the other or rear end portion of the pipe lland has operatively mounted therein the spring closed valve 14. A pipe 15 extends from one side of the casing 13 and has mounted thereon a handle 16. A flexible hose 17 is connected with the free end portion of the pipe 15 for supplying fluid under pressure to the device.

A lever 18 is pivotally mounted for swinging movement on the pipe 15 as at 19 adjacent the valve casing 13. The lever 18 is operatively connected to the stem 20 of the valve 14 through the medium of the pin and slot connection 21. The valve stem 20 extends slidably through the closure plug 22 in the rear end portion of the valve casing 13.

The coil spring which normally maintains the valve 14 closed is designated by the reference numeral 23 and encircles the stem 20 and has one end engaged with the plug 22 and its other end engaged against the valve 14 for yieldingly urging said valve toward its seat. A leaf spring 24 is suitably mounted on the pipe 15 and is operatively engaged with the lever 18 in a manner to yieldingly urge said lever outwardly to inoperative position and away from the handle 16.

This permits closing of the valve 14 when it is so'desired. A vent branch pipe extends downwardly and rearwardly from an A closure plug 12 is intermediate portion of the pipe 11 and terminates, at its free end, in an upturned portion 26 into which is threaded a coupling 27 A valve casing 28 is threaded into the coupling 27 and has operatively mounted therein a spring closed vent valve 29, mounted on the stem 30 which extends slidably through the apertured outer end wall of the casing 28.

A head 31 is mounted on the outer end of the valve stem 30 for engagement by the lever 18, said head 31 being disposed in the path of the lever 18 when said lever is swung outwardly by the spring 24:. A coil spring 32 encircles the valve stem 30 between the coupling 28 and the head 31 for engaging the valve 29 on its seat when the lever 18 swung toward the handle 16 to open the valve 14.

A piston 33 is mounted for longitudinal sliding movement in the barrel or cylinder 1 and said piston may be of any suitable construction.

In use, the closure 2 is removed from the barrel or cylinder 1 and the piston 33 is moved into the rear end portion of, the barrel or cylinder byany suitable means. Thematerial to be dispensed is then placed in the barrel and the closure 2 is replaced. The operator, when he desires to eject the contents of the barrel 1 or a portion of said contents through the conduit 1, swings the lever 18 toward the handle 16 to open the valve it against the tension of the spring 23 and the piston actuating fluid is thus permitted to pass from a suitable source of supply into the barrel or 5 cylinder 1 rearwardly of the piston 33 to move said piston forwardly in an obvious manner for ejecting the contents of the barrel or cylinder.

. As before explained, when the lever 18 is swung toward the handle 16 to open thesup- I ply control valve 1 1, said lever 18 is disengaged from the head 31 and the vent valve 29 is closed by the spring 32'. When the desired quantity of the contents of the barrel 5 or cylinder 1 has been ejected, the operatorreleases the lever 18 and said lever is swung. outwardly to inoperative position by the v spring 2&. This movement of the lever 18 closes the fluid supply control valve let and opens the vent valve 29 by engagement with the head 31 on the valve stem 30.

In this manner the barrel or cylinder 1 rearwardly of the piston 33 is automatically vented when the actuating fluid is shut off and the pressure behind the piston 33 is thus immediately relieved. The threaded connection of the elbow 7 with the coupling 8 permits swinging movement of the barrel or cylinder 1 in a horizontal plane relative to the pipe 9 and the handle 16, as will be apparent.

It is believed that the many advantages of a dispensing gun constructed in accordance with this invention will be readily unden- =5 stood, and although the preferred embodiconnection with said valve, said conduit being provided with a venting branch having a normally closed outlet valve in the path of travel of and adapted to be engaged by said manually actuated lever and a spring constantly urging said manually actuated lever into engagement with said outlet valve.

2. Ina pressure control and vent means for fluid dispensing devices, a handle having a fluid conduit extended therethrough, a normally closed valve controlling the flow of fluid through said conduit, said valve being extended parallel to the axis of said handle, a manually actuated lever pivoted to the con duit and having connection with said valve, said conduit being provided with a venting branch having a normally closed outlet valve in the path of travel of and adapted to be engaged by said manually actuated leverand a spring constantly urging said manual-- ly actuated lever into engagement with said outlet valve, said branch being in the plane of said conduit and said handle and being in spaced relation to the handle to cooperate therewith in the formation of an, opening forthe-passage of a portion of the hand of an operator. v

In testimony whereof I aflix my signature.

ROBERT V. LATHAM. 

